Improvement in ventilators



,.1. BALLOU.

. Ventilators.

No. 142,140. PtentedAugu st26,l873.

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Attorneys.

UNITED STATES PATENT OFFICE.

JOHN BALLOU, OF BOSTON, MASSACHUSETTS.

|MbRovEMENTIN VENTILAToRs.

Specification forming part of Letters Patent No. 142,140, dated August26, 1873 application filed April 26, 1873.

To all whom it may concern:

Be it known that I, JOHN BALLOU, of Boston, in the county of Suffolk andState of Massachusetts, have invented a new and useful Improvement inVentilators, of which the following is aspecification:

My invention is an improvement in the class of ventilators for dwellingsand other edifices which are formed partly of wire-gauze or otherperforated material, and partly of glass or other imperforated material.The invention consists in a revolving ventilator in the form of a cross,to the respective arms of which wire-gauze and glass plates are secured,as hereinafter described.

In the accompanying drawing, Figure 1 is a front view, showing myventilator applied to a window. Fig. 2 is a vertical section of Fig. 1,taken on the line an 00. Fig. 3 is a detail, showing one of the pivotson which the ventilator is suspended so as to revolve.

Similar letters of reference indicate ,corresponding parts.

This ventilator consists of a frame, a, which is of the size of theopening in the window or wall, in which frame is' placed one or moreplates of glass or other transparent material to admit light and closethe opening. This frame is hung on central pivots b b, so that it willrevolve. In practice, I hang this frame to an outer removable frame, 0,which may take the place of one of the sashes of a window; and I preferthis mode of applying the ventilator, but it may be arranged in anopening without an outer removable frame. At right angles with theglass, and on each side thereof, attached to the frame a at or near thepivots, I place a piece of perforated metal, wire-gauze, or similarmaterial, (1, of half the size of the glass, both pieces being equal insize to. the glass in the frame a. These pieces are supported by thebraces c, which are attached to the frame a, as seen in the drawmgs.

It will be seen that, by a quarter revolution, the glass will be throwninto a horizontal position, and the perforated pieces (1 cl will takeits place, thus admitting air while excluding insects.

It is likewise apparent that, whatever be the position of theventilator, the light is never excluded, while its adjustment may bealmost instantaneously effected for admission or exclusion of air.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- The improved revolving ventilator formed of theperforated plates at d and glass plates, attached to the frame a atright angles to each other, and radiating from the axis terminating inthe pivots b b, as shown and described.

JOHN BALLOU. Witnesses:

J. W. SNOW, H. P. YOUNG.

